| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Experimental Observation of Cumulative Second-Harmonic Generation of Circumferential Guided Wave Propagation in a Circular Tube |
| DENG Ming-Xi**, GAO Guang-Jian, LI Ming-Liang |
Department of Physics, Logistics Engineering University, Chongqing 401331
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| Cite this article: |
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DENG Ming-Xi, GAO Guang-Jian, LI Ming-Liang 2015 Chin. Phys. Lett. 32 124305 |
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Abstract The experimental observation of cumulative second-harmonic generation of the primary circumferential guided wave propagation is reported. A pair of wedge transducers is used to generate the primary circumferential guided wave desired and to detect its fundamental-frequency and second-harmonic amplitudes on the outside surface of the circular tube. The amplitudes of the fundamental waves and the second harmonics of the circumferential guided wave propagation are measured for different separations between the two wedge transducers. At the driving frequency where the primary and the double-frequency circumferential guided waves have the same linear phase velocities, the clear second-harmonic signals can be observed. The quantitative relationships between the second-harmonic amplitudes and circumferential angle are analyzed. It is experimentally verified that the second harmonics of primary circumferential guided waves do have a cumulative growth effect with the circumferential angle.
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Received: 19 September 2015
Published: 05 January 2016
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| PACS: |
43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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43.25.+y
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(Nonlinear acoustics)
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43.20.Mv
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(Waveguides, wave propagation in tubes and ducts)
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